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An optimized chronology for a stalagmite using seasonal trace element cycles from Shihua Cave Beijing North China

机译：利用来自北京华北石化洞的季节性痕量元素周期对石笋进行优化的年代学

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摘要

Stalagmites play an important role in paleoclimatic reconstructions from seasonal to orbital time scales as 230Th-dating can provide an accurate absolute age. Additionally, seasonal trace element and optical layers can provide a precise age. We analyzed the seasonal variability of multiple trace elements on a stalagmite (XMG) in Shihua Cave, Beijing and compared them with results from laminae counting. The results show that (1) the polished section of the topmost part of XMG has obvious bi-optical layers under a conventional transmission microscope, however, laminae are not observed using this method in the rest of the sample, and (2) The variations of P/Ca, Sr/Ca, Ba/Ca, U/Ca and Mg/Ca show seasonal cycles throughout the sample. The PC1 in the Principal Component Analysis (PCA) of five trace elements represents the annual cycle. This stalagmite was deposited over 150 ± 1 years through PC1 peak counting. This result corresponds well with the annual layers and U-Th dating. Trace element cyclicity of PC1 can increase the accuracy of stalagmite dating, especially in the absence of obvious laminae and are a powerful method to identify seasonal changes in a strongly contrasting wet-dry monsoon climate region.
机译：石笋在从季节到轨道时间尺度的古气候重建中起着重要作用，因为 230 Th日期可以提供准确的绝对年龄。此外，季节性痕量元素和光学层可以提供精确的年龄。我们分析了北京石花洞石笋中多种微量元素的季节变化，并将其与层流计数结果进行了比较。结果表明：（1）XMG最顶部的抛光部分在常规透射显微镜下具有明显的双光学层，但是，使用此方法在其余样品中未观察到薄片，（2）变化P / Ca，Sr / Ca，Ba / Ca，U / Ca和Mg / Ca的变化显示了整个样品的季节性周期。主成分分析（PCA）中的五个痕量元素中的PC1代表年度周期。通过PC1峰计数，该石笋沉积了150±1年。该结果与年度层和U-Th年代相吻合。 PC1的痕量元素循环性可以提高石笋定年的准确性，尤其是在没有明显的薄片的情况下，并且是在强烈对比的干湿季风气候区中识别季节变化的有力方法。

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